If it needs only two strokes to complete a cycle, it is called a two-stroke cycle engine or, for short, a two-cycle engine.
如果发动机完成一个工作循环，只需要两个行程，就称为两冲程循环发动机，或者简称两冲程发动机。
A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
Otto built the practical four-stroke internal combustion engine called the "Otto Cycle Engine, " and as soon as he had completed his engine, he built it into a motorcycle.
奥托制造了第一台实用的四冲程内燃机，叫做“奥托循环发动机”，并且当完成制造他的发动机后他就把发动机安装在摩托车上。
The four strokes in the four-stroke-cycle engine, in their proper order, are intake, compression, power, and exhaust.
四冲程循环发动机中，四个冲程的固定顺序是：进气、压缩、作功和排气。
The size, weight, and cost of the engine per horsepower are therefore less, and two-stroke-cycle engines are used in motorcycles and smaller machines (e. g. , lawnmowers and power rakes).
因此，每马力所要求的机器尺寸、重量和价格成本也就降低了，所以二冲程循环发动机多用于摩托车和小型机器（如割草机和动力耙）。
While a modified Otto cycle engine using the "Atkinson cycle" provides good fuel economy, it is at the expense of a lower power-per-displacement as compared to a traditional four-stroke engine.
虽然修改奥托循环发动机使用“阿特金森循环”提供良好的燃油经济性，这是比较传统的四冲程发动机在一个较低的功耗，每位移费用。
In the 4-stroke engine, four strokes of the piston in the cylinder are required to complete one full operating cycle.
在四冲程发动机，四冲程汽缸中的活塞需要完成一个工作循环。
In the 4-stroke engine, four strokes of the piston in the cylinder are required to complete one full operating cycle.
在四冲程发动机，四冲程汽缸中的活塞需要完成一个工作循环。
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